This anime really starts pick up after episode 16. Before epside 16 it seems like your typical anime that drags on with no progression, but after looking back it is actually fleshing out the characters and your building investment in them. This is something that a lot of animes skip, which causes you to not care about the plot or the characters. Having 25 episodes definitely helps.
Sidenote: This is pretty random, but there is a scene that revolves around a plane, and the accuracy of the information in the anime about planes is really surprsing. I work on aircraft, so I found it pretty weird that someone on production knew so much about them.
Anyways, as someone who has delt with depression I think the idea of being able to externally speak to your emotions is interesting. This anime made me think about a lot, and I was always rooting for Nana. Sometimes I would get annoyed about her never making progress, but the reason why gets revealed later in the story and her not being more forward makes sense.
After finishing this anime and review I truly do miss Nana and her sisters... it was very enjoyable and I will be rewatching someday.
